IRAS Explanatory Supplement
V. Data Reduction
D. Point Source Confirmation
D.2 Overview of Seconds-Confirmation
D.2.e Double-Detection Mode
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The double-detection mode was the most common mode of seconds-confirmation. A combined test on flux and position was applied which consisted of a two-degree-of-freedom
2 test.
The n-
position discrepancy
contributed one of the degrees of freedom, and the discrepancy
in the log of the two fluxes in units of the log-flux standard
deviation provided the other. A threshold value corresponding
to sacrificing one real event out of every hundred thousand was
used for this test for unconfused cases, and one corresponding
to sacrificing one real source in a million was used for cases
which had been processed for confusion before arriving at this
point. If this test failed, the drop-dead fell back to rejection
processing as described above; otherwise parameter refinement
was performed for the flux and position (see below), and the next
detection was processed.
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